Mast arm



Jan. 8 1924.

A. SELAH MAST ARM Filed Apzfil 22. 1921 INVENTOR flaward A 8 Patented Jan. 8, 1924.

moun

n A s rrer PATENT entree.

HOWARD A. SELA'H,-;OE2JOH'NS1TOi/V1T PENNSYiVAhIflL, Ameee "so were Erintnriumr,- EQUIPMENT COEMPJA'NY,- n con'ronnrron-or PENNSYLVANIA:

first Ann.

To all whom it may concern Be it known thatl, HOWARD A. SilLAri; a

citizen the United States, and wresident' ofthe city oi Johnstown; county of Cambr'm;

Must r rl'll'l's; and I do hereby' d ckire' the" followm'g to be a full, clear, and eXactfde scription of the invention such as" will en able others skilled inthe art to whicl'r'it 'ap pertains to make and u'sethe'sanief My invention relates to amast eim"whicll is adapted to be secured to" a pole" or mas't'in order to support alan 'p'oroth'er' apparatus which is hung from theend o'fsal'd arm and provided with means for 'rai'sing'an'd lower:

ing it for cleaning adjusting, replacing. or"

handlingthe same for any purpose'.

My invention consists generztlly'of en 'arin' l end for securing it to a wooden or metal pole and 18 prov ded )V'ltli mpu'lleyethits inner end and a h Ianila' cottony wire or other I I toe sli'glftly' greater extent than" when placflexible rope passing over'sztidp'u'lley preferably through said" tubular member,

which Ineinber is elso provided'at its outer" end with an outer 'bra'cl'ret carrying another? pulley over which said-rope passes, and'w'hich' outer bracket is secured in a inzinnerherin after to be described in further detail.

This mast arm may also be provided with secured to the mast or pole 'onwhich thej mast 211111 is mounted to further brace" and maintain the arm in position'j 7 One of the particular features of myun; vention resides in theconstruct onf'of the outer bracket or" the mast ar wvnieh' is pro vid'ed with grooves or openingsthrein'and with interior ribs arranged within thmgrne in such a way that by ullin iupon thw rope which supports the lamp, the larn'p is:

' raised end the ribs before"inentibned'guide the lamp hzinger in such a way thetwvh'en' the end of the lamp hanger" is in the outer bracket and the rope" is' slightly slacl'z'ened" I end elevation of the; outer bracket showing the pipe strut onwhich' itis' mounted insectransverse ribs and projections onthe inside of the outer bracket. I Another and further out'and the l'dm 'aiaillowed'tobe ldwlfed by revity; whereupon enother'f set of inclined ri'b's" on flanges Within the outer]brr'cl ietguides the Imp; han er uuvmuyi so tha the lampim'ay' be lewered 'ddvvn' f to a paint neerthe round where an pe-veer c'gin clean, adjust or rplace'it' as inay be desired. 7 p I @therprior cojnstru'ctionjs or" this" kind" have required that the Outer bracket should" b'p'ivoted' orhirige'd requiring a movement thereof inorder to operet'eto ihold' or to release the lamp; and others have movable ptwls or detents, whereas "outer 'brjcket is firmly fixed 'an'd"has no 'suc h 'rnoving par and consequently he's no pivot to I becoine Ilopereti've'by re'esonof i'ceof Show, a ndhes no pivotpin Whichin the prioftj pescorrode' tos'uch' enextent as to-beconieuse1ess=in a comparatively sho'rfltinie." v As before stated; eter bi'ejcket' is provide'd with inclined entering grudesmid a ha 'n'ge'r' supp o'rtb'elo w the same, and'when' th e lmiiphangejr israi'sed lryjniegin's' of the rope ing it infpositifo'n'it then coinesinto 'contect when"lowei'ed',"with"the upper-surface o the inclined guides which allow' it to be ireely" discharged from the outer brelcketf Hh'ving Hus given 'afgener'al' desc'riptio'n of myfinviition; will now; in order td make-the matter more elem; refer to the an: nested" sheet 'Kojf drawings; iwhi'clf forins part ofthis specification, and fin which like characterfs referto like parts? Figured ise'sidef eleve t'io'nl of I my iinproved 'mtst arm'flsl iowi'n'g its" inner end 1 mounted upon the upper portion of a;

will cause thelalnp heng'erito be liftedto a the pip strut/"on whichit is Mounted bein shown in transverse section. Figure 8 is a vertical longitudinal sectional elevation through the inner bracket casting taken on the line VIIIVIIT of Figure 7. Figure 9 is a bottom plan view of my improved mast arm, the lamp post being shown in cross section, and Figure is a detail bottom plan view of the connecting ends of the inner and outer brackets.

Referring now to the characters of refernce on the drawings :-1 is the upper end of alamp post which may be of any convenient height, and which is shown as wood but which, as before stated, may be of metal, 2 is the inner bracket which is secured thereto by the lag screws 3, but these may be through bolts if desired, 1 are the flanges oi the inner bracket whereby it is secured to the lamp post, 5 is-the body portion of the inner bracket 2, 6 is the strengthening ribformed on the bracket 2, '7 is aside flange of the inner bracket provided with bolt holes through which it co-operates with a clamp ing member 8, the bracket having a projection 9 over which the hook of the clamping member is passed, as particularly illustrated in Figure 7, and when the bracket is on the pipe strut 14 it is secured firmly in position thereon by screwing up the nuts of the bolts 10. Within the inner bracket 2 a sheave 11 is mounted on the bolt or pivot pin 12 between the side portions 13. Secured within the inner bracket by means of the clamp 8, is the pipe strut 1 1 and through this pipe andover the sheave 11 the rope or cable 15 is rove.

Brace rods 16 are secured to one end of the outer bracket as illustrated and their upper ends are secured to and through the mast or post by a bolt, which may prefererably be a through bolt, passing through the mast and the eyes in the upper ends of each brace rod. The outer bracket in general is 17, provided with an upper curved portion 18, the downwardly extending front portion 19, the upper portion having the integral longitudinal rib 20 to stiffen and strengthen'it, and this is further provided with the side flange 21 having holes therei through and with a projecting portion 22 on the opposite side thereof adapted to receive the clamp member 23 which is provided with a hook as illustrated which engages with the projection 22 and the other end issecured to the side flange 21 by means of the bolts 24 in a manner similar to that used in connection with the inner bracket. This manner of connecting the parts together forms a very ready means for securof which is secured thereto by a pair of nuts which clamp the rod firmly to the ear. Within the outer bracket a sheave 26 is mounted similarly to the inner sheave, this being mounted on the pivot pin or bolt 27. The outer bracket is further provided with outwardly and downwardly extending sides 28 between which the sheave is mounted and which in addition also serve as a protection and guide for the same and for the rope which passes over the sheave. The outerand lower end of the bracket is provided with a slot 29 therein .t'ormed by the inwardly projecting ribs or flanges 30, this slot being of a width less than the diameter of the head or annular flange 36 at or near the top of the lamp hanger and only slightly larger than the body of the hanger 35, as particularly illustrated in Figures 4 and 6.

An enlarged opening 31 is also provided near the upper part oi the flanges 30, and this is of a size adapted to receive the head 86 of the lamp hanger. A pair of transverse flanges 32 are also provided within this construction, these also being spaced apart a distance less than the diameter of the head 36 and slightly "further apart than the diameter of the body 35 of the lamp hanger. A pair of inclined ribs 33 are also provided one on the inside of each side 28 ot the outer bracket which are spaced apart similarly to the outer ribs and 32 and serve to guide the lamp bracket in position as it is being pulled upwardly as will hereinafter be described. An opening 34 is also provided in the outer bracket, which opening is of a diameter larger than the head 36 of the hanger and through which opening the lamp hanger is discharged when being lowered.

The lamp hanger in general is 35, provided with the enlargement or annular flange 36 which may be near or at the upper portion thereof, the top of which is preferably rounded or beveled in order to be guided more freely, while the lower part is substantially flat in order to form a firm by which the hanger is supported on the ribs or transverse flanges 32. The hanger is provided with a curved socket 37 near the lower portion thereof, and a clamping dlsk 88 provided with a clamping bolt 39 whereby the end of the rope is clamped within the hanger by tightening u) the nut of the bolt 39, these being particu arly illustrated in Figures 2 and 3. The base of the hanger is provided with the ring 40 formed in the shape of a helix on which the lamp 4:1 is hung by means of its upper hook or eyebolt.

The operation of my apparatus is as follows: As illustrated in Figure 1, the lamp is hanging in its fixed position with the annular flange or head 36 resting upon the cross transverse flanges of the supports 32.

Assuming now that it is desired to lower the lamp; it is pulled upwardly, whereupon the head portion 36 will strike the inclined flanges or guides 33 and be guided inwardly thereby and after the head portion 36 is well above said inclined flanges 33 the cable is slacked or paid OH and the lamp allowed to be lowered by gravity, whereupon the bottom portion of the flange 36 will contact with the two flanges or ribs 33 which are spaced to a distance less than the outside diameter of the flange 36 but only slightly larger than the body portion of the hanger. The hanger with attached lamp therefore slides down the inclined flanges 33 and is discharged through the opening 3l and can be lowered to any extent desired. The lamp now being in its lowered position and it is desired to raise it, the cable is pulled steadily i upwards, and the end of the rope which, by

gravity, remains in a substantially vertical position passes over the pulley 26 and as the head 36 approaches the guide flanges 33 it is guided inwardly by them, and as the operator feels the contact of the lamp hanger with said flanges he then lowers the lamp slightly and the hanger is then supported by its head 36 on the transverse flanges 32, the opening between which is less than the outer diameter of the head 36 but slightly greater than that of the body portion 35.

By means of this construction I provide a stationary outer bracket which is not re quired to be pivoted or operated as in prior constructions and has no moving pawls, de-

tents etc. and which by reason of its fixity is not subject to deterioration by wear and is not put out of commission by snow or sleet.

Although I have shown and described my invention in considerable detail, I do not wish to be limited to the exact and specific details thereof, as shown and described, but may use such modifications in, substitutions for, or equivalents thereof, as are embraced within the scope of my invention, or as pointed out in the claims.

Having thus described my invention, what I claim and desire to secure by Letters Patent is 1. An outer bracket immovably secured to a mast arm by a two-part clamp-support having a hook and a cooperating projection at one end and a pair of opposed bolted lugs at the other end, one part of said clampsupport having a pair of side members with their lower portions inclined to deflect an to a mast arm by a two-part clamp-support having a hook and a cooperating PIOJGCtiOI] fitting within said hook at one end and a pair of opposed bolted lugs at the other end, one part of said clamp-support having a pair of side members spaced apart and projecting downwardly, with their lower ends inclined to deflect an entering lamp hanger, a sheave mounted between said side members, a cable, passing over said sheave, to the end of which is secured a lamp hanger comprising a body portion and an enlarged annular flange near the upper end thereof, transverse horizontal flanges extending inwardly near the bottom of said side members and inclined flanges extending inwardly above the same, the opposite flanges being spaced apart a distance slightly greater than the diameter of the body of the lamp hanger but lessthan the diameter of the enlarged annular flange thereof, whereby when the lamp hanger is pulled upwardly by the cable a certain distance and lowered, it is held by the lower transverse horizontal flanges and when pulled upwardly a further distance and lowered it is discharged by means of the inclined flanges.

In witness whereof I hereunto aflix my signature.

H. A. SELAH. 

